Clamp



FIG. 1 is a perspective view of the clamp.

FIG. 2 is a first side elevation view thereof.

FIG. 3 is a second side elevation view thereof.

FIG. 4 is a first end view thereof.

FIG. 5 is a second end view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

The inner surface, outer surface portions and boundary lines shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a clamp, as shown and described. 